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Kernel stack

     I haven't been able to figure out about how the kernel stack is
maintained. From what I read, each task_struct has pointers to both the the
kernel stack and process stack, but both these stacks are with respect to a
process.  what happens during a hardware interrupt?....where is the stack
in this case as we enter the kernel mode  without a valid "current"
do we "steal" the kernel stack of a process or is there a separate stack to
deal with this?